Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

 
 

Configure Path MTU Discovery

Configuring Path MTU Discovery on Outgoing TCP Connections

By default, path MTU discovery on outgoing TCP connections is enabled. To disable path MTU discovery, include the no-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:

To reenable path MTU discovery on outgoing TCP connections, include the path-mtu-discovery statement at the [edit system internet-options] hierarchy level:

Configuring IP-IP Path MTU Discovery on IP-IP Tunnel Connections

By default, path maximum transmission unit (MTU) discovery on outgoing IP-IP tunnel connections is enabled.

To disable IP-IP path MTU discovery, include the no-ipip-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:

To reenable IP-IP path MTU discovery, include the ipip-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:

Configuring Path MTU Discovery on Outgoing GRE Tunnel Connections

By default, path MTU discovery on outgoing GRE tunnel connections is enabled. To disable GRE path MTU discovery, include the no-gre-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:

To re-enable GRE path MTU discovery, include the gre-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:

Note:

To verify details of the path MTU on outgoing GRE tunnels, use the command show interfaces (GRE).